F / faecŭla
noun

faecŭla

gen. faecŭlae · gender feminine · decl. 1st
(also , and contracted , Cael. Aur. Tard. 2, 1), , dim. id.
burnt tartar; salt of tartar
burnt tartar or salt of tartar, deposited in the form of a crust by wine (used as a condiment or as a drug), Lucr. 2, 430; Hor. S. 2, 8, 9; Scrib. Comp. 226 al.